I was on mile 90 of a 95 miler on my Allez, suffering pretty bad just to maintain 15-16 mph. My diaphragm muscles hurt with any hard breathing (or laughing or hiccups or talking too loud). I got passed by an old couple on hybrids with racks and fenders, dressed in baggy wind suits. They slowed down to talk to me and asked me if I was riding my bike through Sheboygan (about 45 miles south of where I was) a couple of hours earlier. They were locals, but had been at the farmer's market and craft swap there, and said they had seen me and my friends there. I told them I had started in Milwaukee and they said that it looked like we were having so much fun, they went for a ride when they got home.
So, yes, I did get passed by two 50-somethings on hybrids while I was all roadied-out but I guess that's fine with me since they had been inspired to go on a ride themselves!